Mutant coronavirus variants are a growing threat
LOS ANGELES – While emerging coronavirus variants remain a threat, health experts said they are hopeful that rising vaccination rates and continued wearing of masks can blunt the potential new waves.
There are indeed concerns about whether the immunity offered by vaccines will be less effective against some coronavirus variants, including the strain first identified in South Africa, B.1.351, and the homegrown California strain, B.1.427/B.1.429.
Researchers at the University of California, San Francisco said that in lab tests, the California strain was more resistant to the effects of neutralizing antibodies that are generated by the immune system in response to COVID-19 vaccines or by a previous coronavirus infection. Compared with other variants, the protection provided by the antibodies was reduced by a “moderate ... but significant” amount, the UCSF researchers said.
When the neutralizing antibodies went up against the homegrown strain, their effectiveness was cut in half. By comparison, when these antibodies encountered the coronavirus strain that’s now dominant in South Africa, their effectiveness was reduced to one-sixth of their usual levels.
Vaccine makers have begun working on booster shots that would be a better match for the new variants. But researchers say that the vaccines are still quite good and remain our best bet for being protected against the virus. Doctors urge people to get the shots as soon as they’re eligible.
The vaccination campaigns are an important contributor to the continuing decline in daily coronavirus cases, and that trend is gratifying, Dr. Eric Mcdonald, medical director of the San Diego County epidemiology department, said this week.
Mcdonald said Wednesday that even if the California strain “is a little more contagious than the other ones that are circulating in the community, the takehome message is the same: that you need to do all the things that we’ve recommended to prevent transmission – so, wearing masks, social distancing, staying at home.”
Vaccinations have been a factor in the decline of new coronavirus cases in L.A. County, along with the fact that so many residents have developed some immunity through exposure to the virus. Health officials also credit residents’ greater adherence to guidelines about wearing masks in public and avoiding social gatherings since the autumn-and-winter surge began. (Officials have also not detected a surge in cases related to gatherings over the Super Bowl weekend.)
In L.A. County’s
skilled nursing facilities – among the first places where vaccines were administered – new daily coronavirus cases have plummeted in the last few weeks, Public Health Director Barbara Ferrer said this week. As of Feb. 7, the average number of daily coronavirus cases associated with residents in skilled nursing facilities was just five. Four weeks earlier, that number was more than 100.
As of Feb. 14, 74% of residents eligible for shots at skilled nursing facilities in L.A. County, and 77% of staff, had received their first dose of the COVID-19 vaccine. Of those who’ve had their first dose, 83% of staff and 79% of residents have received their second shot as well.
“With many more staff and residents vaccinated, new cases should continue to decline, which does mean less outbreaks, and fortunately, less deaths,” Ferrer said.
Dr. Anthony Fauci, the U.S. government’s top infectious diseases expert, said the rise of the variants made it all the more essential that people get vaccinated as soon as they can.
“Take the vaccine. This is a race … between the virus and getting vaccines into people,” Fauci said Thursday on NBC’S “Today” show. “The longer one waits on getting vaccinated, the better chance the virus has to get a variant or a mutation.”